John Deere 6300 3 point hitch pulsing/bouncing

[ricardodba]

Hi,

Happy New Year!

I have a problem with my JD 6300. The 3 point hitch pulses/bounces up and down slightly (a few inches) - this seems to be most noticible when I have an implement on back in my case an 800kg grader.

Also, when I raise the 3 point to its highest point, it seems to give the engine a work out/ still pumping the hydraulic pump. - like it doesnt sense its reached the top... ..Any ideas what these issues could be?

Cheers.

 

[Rs chunk]

Sounds like your lift is out of calibration or your height sensor is faulty

 

[bravheart]

Have you turned the draft sensitivity/response off?

 

[ricardodba]

I have the load/depth nob set to 1.

if i then raise the implement to different heights with the rockshaft controller the 3 point hitch arms pulse/bounce up and down. If i set the implement on the floor ie with rockshaft controller all the way down it doesnt do it.

 

[gpikcil]

You need to adjust hitch stepper motor lower valve. Valve looking foward its lift and valve looking back its lower valve. Make mark on lower valve undo big lock nut and turn middle valve anticlockwise for 45degrees. Lock nut and test. If still plays turn anticlockwise more 45degrees. Do not turn too much I have done many times and never turn more than 360 degrees (1 full revolution). Try and should be good

 

[ricardodba]

Hi, Thanks for that.

Looking at the repair manual I see this:

Centering the Stepper Motor
LX005001-UN: Press Stepper Motor Pin with Screwdriver
IMPORTANT:
Before carrying out this adjustment, make sure the ignition is off.
Remove cap from stepper motor.
Use a screwdriver to press down the pin on the stepper motor and turn it slightly until it engages. While pressing down on
the pin, feel for the left and right stop positions of the stepper motor and adjust so that the distance from stop to stop is the
same. Then release the pin.

Is this what you mean?

Cheers

 

[335d]

What Position are the two knobs in below the flap at the back of the lift lower lever?

 

[ricardodba]

What Position are the two knobs in below the flap at the back of the lift lower lever?

For the up position nob its at 9
and for the down position nob its at 7

ive tried this at different settings but it doesnt stop the issue.

 

[Qman]

The down knob is a draught/position control knob and should be in position 1 for position control. Try this and let us know.

I say again...there is NOT a down position knob!

 

[ricardodba]

The down knob is a draught/position control knob and should be in position 1 for position control. Try this and let us know.

I say again...there is NOT a down position knob!

I think im getting confused with which nobs you mean.

Here is how I understand the nobs:

Under the flap (to the right of the hitch control unit) there is a down nob which controls the speed of how fact the implement drops - mine is set at 7. There is also an nob for which height the hitch rises to - mine is set to 9.

To the right of nobs under the flap is the load/depth control nob. This has numbers/settings 1 to 5.

1 is for depth control
2 - 4 is Mixed control
5 is load control.

As im grading i want a float setting so set the load/depth control nob to 1 and set the hitch control unit all the way to the left (as per the operator manual instructions).

 

[Qman]

Sorry I've told you wrong, the 2 small knobe are the lift height and the lowering speed. The other knob numbered 1-5 is the one you need to look at. Position 1 is the one you need, position 5 is full draught control and when I'm ploughing I put it in position 3. So if you put it in 1 and have your hydraulic lever in down you will be OK. I think from your post you might have the old hydraulic round dial, so put that in the fully down position.

I've been to look at my 6420 to make sure I'm correct, let us know how you get on please.

 

[ricardodba]

Sorry I've told you wrong, the 2 small knobe are the lift height and the lowering speed. The other knob numbered 1-5 is the one you need to look at. Position 1 is the one you need, position 5 is full draught control and when I'm ploughing I put it in position 3. So if you put it in 1 and have your hydraulic lever in down you will be OK. I think from your post you might have the old hydraulic round dial, so put that in the fully down position.

I've been to look at my 6420 to make sure I'm correct, let us know how you get on please.

Yeah that's right. I have the old 'wedding cake' round hitch control. The issue is when im grading is i have the load/depth nob (the one numbered 1-5) set at 1 and when i put the hitch control all the way down so its on the floor, there is no pulsing as its simply all the way down as far as it can go and sitting on the floor. However, if i lift the hitch control slightly off the floor , if i need to do some light grading so the garder blade is just barley biting the hitch pulses up and down a few inches i.e. it only pulses when the implement is raised off the floor.

The other issue i have is when i raise the implement all the way up on the hitch control, the hydraulic pump is still working and seems its trying to raise still as if it doesnt know its reached the top...although i did notice the other day after 2 hours or so of grading and getting tractor up to temp this issue went away.

I think i have 2 sep issues here??

 

[Qman]

I think you might be better getting a mechanic to look at it.

I take it that the oil is at the correct level and is the correct type. And are both the hydraulic filters clean or do they need changing? If you change the transmission oil there is a filter on the side that needs pulling out and washing in kero.

 

[ricardodba]

tbh i dont know...got Tractor in August and was told hydraulic and oil service just been done...and to be fair the filters looked brand new.

Guess I can always look at topping up hydraulic oil or doing a full change??...never done hydraulic oil changne before but have done usual car services my self.

 

[gpikcil]

If tractor pump still pumps when hitch goes up i will say that need to do hitch calibration. Easy to understand if you will lift hitch up and look what hitch possition sensor is showing. (exapmle: if you lift hitch full up it should go to 100%, but if you have something to heavy it goes to 98-99% and can not lift up. As computer still wants to lift to 100% so stepper motor still pushing raise valve, it mean still send load sense oil pressure to pump to pump max oil pressure. Look if pump still pumps when no load on arms and hitch full up. If no pump when no load, adjust you lift hight knob slightly back, so never will want to lift max 100% up.)
Did you try to do what i told before?? I am fixing JD for 15 years, and have saw many time when hitch pulses up and down only when they have load on arms and all good when no load. If you think that is something with draft sensor, so disconnect draft sensor or look what voltage sends to controller, OR disconnect and fit ressistor. I have done on R serie tractor when customer dont want to fix his draft sensor, so we just by-pass. 6R needs 147Kohms resistor to bypass sensor.
Dont look to repair manual what you send before as you never will feel where is middle with screwdriver. unless you are so good that can feel by turning screwdriver 1-2 mm diference??? Just take spanners, adjust 45 degree anticlockwise if still goes up and down adjust more. Should be enought max 1 full revolution. if need go slightly more back. Just make mark before doing so if you are not sure after test you all the time can go back to the same possition back.
Where about you are??

 

[haybob]

Sorry to but into old thread. I notice my 6220 pulses when lifted all the way up. Is it normal to do that ? The lift arms suddenly can shoot all the way to the top when I press the external button?! I definitely know it shouldn't be doing that!

 

[ricardodba]

Hi,

Not sure about the external button or how it works.

If the hitch is raised off the floor and its pulsing up and down without any touching of the controls then per gpikcil posts above - this will likely fix it - it did for me and its such a simple fix.

Does it do as you say with an implement attached?

Cheers.

 

[haybob]

I haven't tried with a implement. Don't want to play around with it too much. I was lucky to notice it last week before I got a implement half attached!

 

[ricardodba]

Does it only happen when using external button? What are the settings of the 2 dials under the flap next to the hitch control in the cab?

 

[haybob]

Yes when you have the arms down and get out of cab , start pressing the up button out side then it might only move a inch and slow and stop while you are still holding the button, then sometimes you let go of the button and it suddenly shoots all the way up. I have tried the 2 dials at different settings and it still seems to do it. Dealer has ordered a new external switch but I fear it might be more to it. It seems ok in the cab controls but the lift arms can have a small tendancy to move up/down on their own a few inches when im adjusting the cab settings.